From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Blueprints for the Dalby Watson Optical Indicator for use on aero engines.
| Identifier | ExFiles\Box 79\3\ scan0100 | |
| Date | 21th September 1918 | |
| To R.{Sir Henry Royce} from EFC. c. to CJ. EFC1/T21.9.18. X. 3181 - DALBY WATSON OPTICAL INDICATOR Herewith please receive blueprints of Arrgt. . Drawings K.R.67/8 of Dalby Watson Optical Indicator on R.R. Aero Engines. EFC. | ||